.page-about {
  --about-shadow: 0 24px 60px rgba(4, 12, 22, .45);
  background: var(--deep);
  color: var(--text-on-dark);
  font-family: var(--font-sans);
  line-height: 1.85;
}

.page-about .num,
.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-sans);
  font-weight: 800;
  transform: skewX(-6deg);
  line-height: 1.15;
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(56px, 9vw, 104px);
  background:
    radial-gradient(1100px 520px at 88% -10%, rgba(31, 138, 76, .26), transparent 62%),
    radial-gradient(760px 420px at 4% 108%, rgba(79, 163, 209, .18), transparent 60%),
    var(--deep);
  overflow: hidden;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 6vw, 72px);
  align-items: center;
}

.page-about .about-hero__copy {
  max-width: 640px;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--cream);
  border-color: var(--green);
}

.page-about .breadcrumb__sep {
  color: rgba(154, 163, 168, .5);
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-h1 {
  font-size: clamp(34px, 7.4vw, 76px);
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 17px;
  color: var(--text-on-dark);
  max-width: 58ch;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(30px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
  border-top: 1px solid var(--line);
  padding-top: clamp(22px, 3vw, 30px);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-hero__stats strong {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  color: var(--orange);
  letter-spacing: .02em;
}

.page-about .about-hero__stats span {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-index {
  margin-top: clamp(28px, 4vw, 40px);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-about .about-index a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-on-dark);
  text-decoration: none;
  transition: border-color .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  border-color: var(--green);
  background: rgba(31, 138, 76, .16);
  color: var(--cream);
}

.page-about .about-hero__visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.page-about .season-ring {
  width: min(100%, 400px);
  height: auto;
  filter: drop-shadow(0 20px 44px rgba(4, 12, 22, .5));
}

.page-about .ring-base {
  fill: none;
  stroke: rgba(154, 163, 168, .14);
  stroke-width: 26;
}

.page-about .ring-spring,
.page-about .ring-summer,
.page-about .ring-autumn,
.page-about .ring-winter {
  fill: none;
  stroke-width: 26;
  stroke-dasharray: 188.5 565.5;
  stroke-linecap: butt;
}

.page-about .ring-spring { stroke: var(--green); }
.page-about .ring-summer { stroke: var(--orange); }
.page-about .ring-autumn { stroke: var(--gold); }
.page-about .ring-winter { stroke: var(--winter); }

.page-about .ring-core {
  fill: rgba(11, 27, 43, .86);
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .ring-label {
  fill: var(--cream);
  font-family: var(--font-sans);
  font-size: 40px;
  font-weight: 800;
  text-anchor: middle;
  letter-spacing: .04em;
}

.page-about .ring-sub {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .34em;
  text-anchor: middle;
}

.page-about .about-hero__caption {
  margin: 0;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mist);
  text-align: center;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(56px, 9vw, 108px) 0;
}

.page-about .about-section--dark {
  background: var(--deep);
}

.page-about .about-section--deep {
  background: var(--deep-2);
}

.page-about .about-section--light {
  background: var(--cream);
  color: var(--stone);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num band"
    "num title";
  align-items: center;
  gap: 6px clamp(14px, 2vw, 22px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .chapter-num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: clamp(37px, 6.4vw, 72px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: .02em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(154, 163, 168, .55);
}

.page-about .about-section--light .chapter-num {
  -webkit-text-stroke-color: rgba(74, 79, 82, .42);
}

.page-about .chapter-band {
  grid-area: band;
  display: block;
  height: 6px;
  width: min(160px, 34vw);
  border-radius: 999px;
  background: var(--green);
}

.page-about .chapter-band--summer { background: var(--orange); }
.page-about .chapter-band--autumn { background: var(--gold); }
.page-about .chapter-band--winter { background: var(--winter); }
.page-about .chapter-band--clay { background: var(--clay); }

.page-about .chapter-head h2 {
  grid-area: title;
  font-size: clamp(24px, 4.6vw, 44px);
  color: var(--cream);
}

.page-about .about-section--light .chapter-head h2 {
  color: var(--ink);
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1.2em;
  font-size: 17px;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0 0 clamp(26px, 4vw, 40px);
  font-size: 17px;
  color: var(--text-on-dark);
}

.page-about .about-section--light .about-lede {
  color: var(--stone);
}

.page-about .about-note {
  max-width: 62ch;
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 15px;
  color: var(--mist);
  border-left: 3px solid var(--clay);
  padding-left: 16px;
}

/* ---------- 四季格子 ---------- */
.page-about .season-quad {
  margin-top: clamp(30px, 5vw, 52px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .season-cell {
  background: var(--deep-3);
  padding: clamp(22px, 3.2vw, 32px);
  border-top: 4px solid transparent;
  transition: background .3s var(--ease), transform .3s var(--ease);
}

.page-about .season-cell h3 {
  font-size: clamp(19px, 2.4vw, 23px);
  color: var(--cream);
  margin-bottom: 10px;
}

.page-about .season-cell p {
  margin: 0;
  font-size: 15.5px;
  color: var(--text-on-dark);
}

.page-about .season-cell--spring { border-top-color: var(--green); }
.page-about .season-cell--summer { border-top-color: var(--orange); }
.page-about .season-cell--autumn { border-top-color: var(--gold); }
.page-about .season-cell--winter { border-top-color: var(--winter); }

.page-about .season-cell:hover {
  background: #162F45;
  transform: translateY(-2px);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--deep-3);
  box-shadow: var(--about-shadow);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform .8s var(--ease);
}

.page-about .about-figure:hover img {
  transform: scale(1.02);
}

.page-about .media__caption {
  display: block;
  padding: 12px 18px 14px;
  font-size: 13.5px;
  color: var(--mist);
  background: var(--deep-3);
}

.page-about .about-section--light .about-figure {
  background: #E6E1D6;
  box-shadow: 0 18px 44px rgba(11, 27, 43, .14);
}

.page-about .about-section--light .media__caption {
  background: #E6E1D6;
  color: var(--stone);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  position: relative;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: 2px solid var(--line-strong);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline__dot {
  position: absolute;
  left: -8px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(11, 27, 43, .9);
}

.page-about .timeline__item--summer .timeline__dot { background: var(--orange); }
.page-about .timeline__item--autumn .timeline__dot { background: var(--gold); }
.page-about .timeline__item--winter .timeline__dot { background: var(--winter); }

.page-about .timeline__title {
  font-size: clamp(20px, 2.6vw, 25px);
  color: var(--cream);
}

.page-about .timeline__meta {
  margin: 6px 0 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 16px;
  color: var(--text-on-dark);
  max-width: 56ch;
}

/* ---------- 版本对照 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-split__col p {
  margin: 0 0 1.2em;
  font-size: 17px;
  color: var(--stone);
}

.page-about .about-split__col p:last-child {
  margin-bottom: 0;
}

.page-about .about-split__aside {
  background: #FFFFFF;
  border-left: 5px solid var(--clay);
  border-radius: var(--r-s);
  padding: clamp(22px, 3vw, 30px);
  box-shadow: 0 14px 34px rgba(11, 27, 43, .12);
}

.page-about .about-split__aside h3 {
  font-size: 20px;
  color: var(--ink);
  margin-bottom: 10px;
}

.page-about .about-split__aside p {
  margin: 0 0 20px;
  font-size: 15.5px;
  color: var(--stone);
}

.page-about .about-split__aside .btn {
  text-decoration: none;
}

.page-about .version-compare {
  margin-top: clamp(34px, 5vw, 56px);
  border-top: 1px solid rgba(74, 79, 82, .22);
  padding-top: clamp(24px, 3.5vw, 34px);
}

.page-about .version-compare__title {
  font-size: clamp(20px, 2.6vw, 24px);
  color: var(--ink);
  margin-bottom: 18px;
}

.page-about .version-compare__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(74, 79, 82, .18);
  border-radius: var(--r-s);
  overflow: hidden;
}

.page-about .version-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px 16px;
  padding: 16px 18px;
  background: var(--cream);
}

.page-about .version-row__label {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mist);
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.page-about .version-row__old {
  font-size: 15.5px;
  color: var(--mist);
  text-decoration: line-through;
  text-decoration-color: rgba(154, 163, 168, .55);
}

.page-about .version-row__new {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 28px);
  margin-bottom: clamp(30px, 4.5vw, 46px);
}

.page-about .team-lane {
  position: relative;
  padding: clamp(22px, 3vw, 28px) clamp(20px, 3vw, 26px) clamp(22px, 3vw, 28px) clamp(28px, 4vw, 36px);
  background: linear-gradient(135deg, rgba(31, 138, 76, .14), rgba(11, 27, 43, 0) 62%);
  border-radius: var(--r-m);
  border: 1px solid var(--line);
}

.page-about .team-lane__num {
  position: absolute;
  top: 12px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 42px);
  font-weight: 700;
  color: rgba(242, 166, 35, .34);
  line-height: 1;
}

.page-about .team-lane h3 {
  font-size: clamp(19px, 2.4vw, 22px);
  color: var(--cream);
  margin-bottom: 10px;
}

.page-about .team-lane p {
  margin: 0;
  font-size: 15.5px;
  color: var(--text-on-dark);
}

/* ---------- 服务范围 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 24px);
}

.page-about .reach-card {
  padding: clamp(22px, 3vw, 30px);
  background: var(--deep-3);
  border-radius: var(--r-m);
  border-bottom: 3px solid var(--moss);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .reach-card:hover {
  border-bottom-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .reach-card h3 {
  font-size: clamp(19px, 2.4vw, 22px);
  color: var(--cream);
}

.page-about .reach-card p {
  margin: 0;
  font-size: 15.5px;
  color: var(--text-on-dark);
  flex: 1;
}

.page-about .reach-card__link {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 26, .4);
  padding-bottom: 2px;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .reach-card__link:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .reach-quote {
  margin-top: clamp(30px, 4.5vw, 48px);
  padding: clamp(24px, 3.4vw, 34px);
  border-left: 4px solid var(--gold);
  background: rgba(242, 166, 35, .08);
  border-radius: 0 var(--r-m) var(--r-m) 0;
}

.page-about .reach-quote p {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--cream);
  max-width: 60ch;
}

/* ---------- 品牌表达 ---------- */
.page-about .about-visual {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 46px);
  margin-bottom: clamp(30px, 4.5vw, 46px);
}

.page-about .about-visual__copy p {
  margin: 0 0 1.2em;
  font-size: 17px;
  color: var(--stone);
}

.page-about .about-visual__copy p:last-child {
  margin-bottom: 0;
}

.page-about .swatch-row {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .swatch {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: #FFFFFF;
  border-radius: var(--r-s);
  box-shadow: 0 10px 26px rgba(11, 27, 43, .1);
}

.page-about .swatch__chip {
  display: block;
  height: 46px;
  border-radius: 6px;
  margin-bottom: 4px;
}

.page-about .swatch--spring .swatch__chip { background: var(--green); }
.page-about .swatch--summer .swatch__chip { background: var(--orange); }
.page-about .swatch--autumn .swatch__chip { background: var(--gold); }
.page-about .swatch--winter .swatch__chip { background: var(--winter); }

.page-about .swatch strong {
  font-size: 16px;
  color: var(--ink);
  transform: skewX(-6deg);
  display: inline-block;
  font-weight: 800;
}

.page-about .swatch__hex {
  font-size: 12.5px;
  color: var(--stone);
  letter-spacing: .06em;
}

.page-about .swatch__use {
  font-size: 13.5px;
  color: var(--mist);
  line-height: 1.6;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  padding: clamp(48px, 7vw, 84px) 0;
  background:
    linear-gradient(120deg, rgba(31, 138, 76, .22), rgba(255, 107, 26, .12) 58%, rgba(79, 163, 209, .16)),
    var(--deep);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  align-items: center;
}

.page-about .about-cta h2 {
  font-size: clamp(23px, 3.6vw, 36px);
  color: var(--cream);
  margin-bottom: 12px;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 16.5px;
  color: var(--text-on-dark);
  max-width: 56ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .season-quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .version-row {
    grid-template-columns: minmax(140px, 1fr) minmax(90px, .9fr) minmax(120px, 1.1fr);
    align-items: center;
    gap: 16px;
  }

  .page-about .swatch-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: clamp(40px, 5vw, 72px);
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.06fr .94fr;
    gap: clamp(40px, 5vw, 80px);
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .season-quad {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-split {
    grid-template-columns: 1.5fr 1fr;
    gap: clamp(32px, 4.5vw, 56px);
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-visual {
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: clamp(34px, 4.5vw, 60px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: 1.4fr auto;
    gap: 40px;
  }

  /* 时间轴转为横向 */
  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 clamp(16px, 2.4vw, 26px);
    padding-top: 34px;
    border-top: 2px solid var(--line-strong);
  }

  .page-about .timeline__item {
    padding: 0;
    border-left: 0;
  }

  .page-about .timeline__item:last-child {
    border-left: 0;
  }

  .page-about .timeline__dot {
    left: 0;
    top: -43px;
  }

  .page-about .timeline__text {
    max-width: none;
  }
}

@media (min-width: 1180px) {
  .page-about .chapter-head {
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 28px;
  }

  .page-about .about-prose p,
  .page-about .about-split__col p,
  .page-about .about-visual__copy p,
  .page-about .about-lede {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-cell,
  .page-about .reach-card,
  .page-about .about-figure img,
  .page-about .about-index a,
  .page-about .reach-card__link {
    transition: none;
  }

  .page-about .season-cell:hover,
  .page-about .reach-card:hover,
  .page-about .about-figure:hover img {
    transform: none;
  }
}